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Run Dependabot pull requests on GitHub-hosted runners - #348
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Reviewer's GuideThis PR rolls out the established runner-selection pattern so Dependabot pull requests on the public repository use Flow diagram for Dependabot runner selectionflowchart TD
PR[Pull request workflow]
Fork{head.repo.fork?}
Dependabot{pull_request.user.login == dependabot[bot]?}
Hosted[ubuntu-latest]
Paid[Ubicloud runner]
PR --> Fork
Fork -->|yes| Hosted
Fork -->|no| Dependabot
Dependabot -->|yes| Hosted
Dependabot -->|no| Paid
Flow diagram for benchmark runner selectionflowchart TD
Event[Workflow event]
PR{event_name == pull_request?}
Fork{head.repo.fork?}
Author{"user.login != dependabot[bot]?"}
Paid[ubicloud-standard-2]
Hosted[ubuntu-latest]
Event --> PR
PR -->|no| Hosted
PR -->|yes| Fork
Fork -->|yes| Hosted
Fork -->|no| Author
Author -->|yes| Paid
Author -->|no| Hosted
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| Layer / File(s) | Summary |
|---|---|
Recognize fork and Dependabot conditions tests/workflow_contracts/workflow_support.py |
Contract helpers recognize the combined fork-or-Dependabot condition and map the false runner arm to the paid runner. |
Apply runner conditions to workflows .github/workflows/ci.yml, .github/workflows/kani-pr.yml, .github/workflows/property-tests.yml, .github/workflows/benchmark-regressions.yml |
Pull request jobs use ubuntu-latest for forks and Dependabot authors. Other pull requests retain their configured Ubicloud runner. |
Validate and document runner placement tests/workflow_contracts/runner_placement_test.py, docs/developers-guide.md |
Contract tests check for the Dependabot guard. The guide documents the runner conditions and affected jobs. |
Suggested reviewers: codescene-access
Priority:
Change: Other
Merge Risk: 
d3908
-
The runner-placement documentation matches the updated Dependabot behavior, with no remaining actionable merge risk identified.
Pre-merge checks: 
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Check name Status Explanation Resolution Developer Documentation Update the design documentation before merging. The changed workflows add a Dependabot-author fallback and use github.event.pull_request.user.login, butdocs/property-testing-design.md:765-783and…Update docs/property-testing-design.mdanddocs/chutoro-design.mdwith the Dependabot fallback, thepull_request.user.loginauthor check, the paid-versus-hosted runner trade-off, and the current runner shape. Record the 19 October 202…Observability The pull request changes runner placement for Dependabot jobs in four workflows, but it adds no observability at the runner-selection decision. The new expressions are in `.github/workflows/ci.yml:19-… Add an always-running, bounded runner-observation step to every affected job. Write the job name, event class, fork flag, Dependabot flag, runner.environment,runner.os,runner.arch, elapsed job or key-step time, and relevant cache hi…-
Check name Status Explanation Title check The title accurately summarises the main change: routing Dependabot pull requests to GitHub-hosted runners. The description does not provide a GitHub issue number in the required ( #123) form.Description check The description directly explains the runner changes, implementation details, tests, mutation proof, documentation updates, and validation evidence. Docstring Coverage Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 2 files. (1 skipped: 1 … Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Testing (Overall) Accept the testing coverage. The six changed runner selectors are checked through workflow_names()andload_workflow(), which read every workflow file (`tests/workflow_contracts/workflow_support.p…User-Facing Documentation PASS: The pull request changes internal GitHub Actions runner placement for pull-request jobs. It does not change the Chutoro API, CLI, or end-user behaviour. The contributor-facing runner policy is d… Module-Level Documentation Pass. The pull request changes two Python modules, and both retain clear module docstrings. tests/workflow_contracts/workflow_support.py:1-7explains the shared parsing helpers, their utility, and t…Testing (Unit And Behavioural) Mark this check PASS. The change adds meaningful workflow-contract coverage at the actual YAML boundary. runner_placement_test.py:174-207loads every workflow and requires paid pull-request lanes to…Testing (Property / Proof) Keep the existing parameterized contract tests; do not add a property test or exhaustive proof. The change adds finite runner-selection rules in YAML and Python, not a Rust invariant, lemma, or proof … Testing (Compile-Time / Ui) PASS. The pull request changes GitHub Actions YAML, Markdown, and Python contract tests; it introduces no Rust or TypeScript compile-time behaviour, so a trybuild-equivalent test is not required. The … Unit Architecture Pass the Unit Architecture check. The pull request changes only GitHub workflow runner selection, documentation, and pure workflow-contract parsing/tests. The new conditional_runnerpath remains a r…Domain Architecture PASS: The pull request changes GitHub Actions runner selection, workflow-contract test helpers, tests, and developer documentation only. The diff does not change domain logic, domain models, commands,… Full details: Docstring Coverage
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Explanation
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 2 files. (1 skipped: 1 unsupported.)
Full details: Testing (Overall)
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Explanation
Accept the testing coverage. The six changed runner selectors are checked through
workflow_names()andload_workflow(), which read every workflow file (tests/workflow_contracts/workflow_support.py:81-85,139-150).test_paid_pull_request_lanes_fall_back_for_forksnow requires bothNON_FORK_GUARDandNON_DEPENDABOT_GUARD, and requires the fallback arm to use a GitHub-hosted label (tests/workflow_contracts/runner_placement_test.py:174-207). The parser distinguishes the hosted-first combined form from the paid-first benchmark form and recognises the exact author guard (tests/workflow_contracts/workflow_support.py:218-274). Its doctests cover both forms and reject line-broken expressions (tests/workflow_contracts/workflow_support.py:307-353). The Makefile runs these tests with--doctest-modules(Makefile:145-154). These are substantive configuration-contract tests that would fail for a missing Dependabot arm, an actor check, or an incorrect runner arm; they do not rely on mocks or vacuous assertions.
Full details: User-Facing Documentation
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Explanation
PASS: The pull request changes internal GitHub Actions runner placement for pull-request jobs. It does not change the Chutoro API, CLI, or end-user behaviour. The contributor-facing runner policy is documented in
docs/developers-guide.md, including Dependabot selection and the job inventory.docs/users-guide.mdcorrectly remains focused on downstream API consumers, so no user-guide update is required.
Full details: Module-Level Documentation
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Explanation
Pass. The pull request changes two Python modules, and both retain clear module docstrings.
tests/workflow_contracts/workflow_support.py:1-7explains the shared parsing helpers, their utility, and their relationship to the workflow contract tests.tests/workflow_contracts/runner_placement_test.py:1-19explains the runner-placement contract, its purpose, and its relationship to the developer feedback path. The other changed files are YAML workflows or Markdown documentation, not Python modules.
Full details: Testing (Unit And Behavioural)
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Explanation
Mark this check PASS. The change adds meaningful workflow-contract coverage at the actual YAML boundary.
runner_placement_test.py:174-207loads every workflow and requires paid pull-request lanes to include both the non-fork and non-Dependabot guards, with a hosted fallback.workflow_support.py:257-274and its doctests cover both runner-arm orders, guard extraction, plain labels, unrecognised conditions, and line-break rejection. Existing contract tests also cover workflow-reading error paths (workflow_reading_test.py:35-95). The Makefile runs these tests with pytest and doctests (Makefile:145-154). This is appropriate behavioural coverage for the declarative workflow integration and is not limited to mocks or private seams.
Full details: Testing (Property / Proof)
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Explanation
Keep the existing parameterized contract tests; do not add a property test or exhaustive proof. The change adds finite runner-selection rules in YAML and Python, not a Rust invariant, lemma, or proof assumption.
runner_placement_test.py:110-124checks all workflows and approved paid jobs, whilerunner_placement_test.py:174-207checks the fork and Dependabot guards for every paid pull-request lane.workflow_support.py:257-274handles the two recognized runner forms, with doctest examples atworkflow_support.py:307-342. This small, complete configuration table is more suitable than property-based testing.
Full details: Testing (Compile-Time / Ui)
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Explanation
PASS. The pull request changes GitHub Actions YAML, Markdown, and Python contract tests; it introduces no Rust or TypeScript compile-time behaviour, so a trybuild-equivalent test is not required. The structured runner-selection behaviour has focused semantic coverage:
tests/workflow_contracts/workflow_support.py:257-274normalizes both runner-arm forms, andrunner_placement_test.py:174-207requires the non-fork, non-Dependabot guards and a hosted fallback. Doctests cover both selector variants atworkflow_support.py:307-353, andMakefile:150-154runs the workflow contracts with--doctest-modules. Whole-file snapshots are not appropriate here because they would be brittle; the explicit guard and label assertions encode the meaningful expectations.
Full details: Unit Architecture
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Explanation
Pass the Unit Architecture check. The pull request changes only GitHub workflow runner selection, documentation, and pure workflow-contract parsing/tests. The new
conditional_runnerpath remains a read-only query over parsed YAML;_runner_from_armshas explicit inputs and output and performs no I/O, mutation, network call, clock access, or hidden side-effect. The workflow expressions make the runner policy explicit, and the tests verify the guard contract. No new application command, fallible operation, dependency boundary, or mixed-responsibility unit is introduced.
Full details: Domain Architecture
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Explanation
PASS: The pull request changes GitHub Actions runner selection, workflow-contract test helpers, tests, and developer documentation only. The diff does not change domain logic, domain models, commands, repositories, adapters, or transport and persistence boundaries. Therefore it does not introduce a Domain Architecture violation.
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Full details: Developer Documentation
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Explanation
Update the design documentation before merging. The changed workflows add a Dependabot-author fallback and use
github.event.pull_request.user.login, butdocs/property-testing-design.md:765-783and its runner blueprints at:895-918still document only the fork condition.docs/chutoro-design.md:1391-1401still records the old property-runner design, including an 8-core Ubicloud PR runner. The developer guide inventory now includes Dependabot, but no design document or ADR records this runner decision and its hosted-runner trade-off.Resolution
Update
docs/property-testing-design.mdanddocs/chutoro-design.mdwith the Dependabot fallback, thepull_request.user.loginauthor check, the paid-versus-hosted runner trade-off, and the current runner shape. Record the 19 October 2026 decision in the appropriate design document or an ADR. Keep the developer-guide inventory aligned with the workflow expressions.
Full details: Observability
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Explanation
The pull request changes runner placement for Dependabot jobs in four workflows, but it adds no observability at the runner-selection decision. The new expressions are in
.github/workflows/ci.yml:19-22, 231-234,.github/workflows/kani-pr.yml:50-53,.github/workflows/property-tests.yml:38-41, and.github/workflows/benchmark-regressions.yml:34-38, 81-85. The existing cache and disk summaries are unchanged and cover only some jobs; the benchmark and property lanes have no runner or timing summary. The documentation describes the cold-cache consequence, but it is not runtime observability. This leaves hosted-runner queueing, cold-cache degradation, and an incorrect author classification difficult to diagnose from run output.Resolution
Add an always-running, bounded runner-observation step to every affected job. Write the job name, event class, fork flag, Dependabot flag,
runner.environment,runner.os,runner.arch, elapsed job or key-step time, and relevant cache hit/miss state toGITHUB_STEP_SUMMARYor a retained artifact. Do not write the raw pull-request login. Extend the existing cache/disk summaries instead of creating duplicate signals, and add a bounded workflow metric for runner class, duration, cache outcome, and failure category so maintainers can detect hosted-queue or cold-cache degradation without reading the selector source.
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- Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
Forks take the hosted path
Dependabot follows too
Paid runners serve the rest
Contract checks keep the rule
The guide records each case
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chutoro/tests/workflow_contracts/workflow_support.py
Lines 249 to 251 in 3942158
Keep workflow_support.py within the 400-line limit
This change grows workflow_support.py from 389 to 423 lines, exceeding the repository's explicit 400-line maximum for code files. Extract the conditional-runner parsing and its guard definitions into a focused helper module so future workflow-contract changes do not further enlarge this already over-limit shared module.
AGENTS.md reference: AGENTS.md:L31-L34
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @docs/developers-guide.md:
- Around line 231-232: Update the runner descriptions for build-test,
verus-proofs, kani, and property-tests-pr to include Dependabot alongside forks
as cases using ubuntu-latest, matching the selector guidance above.
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.github/workflows/benchmark-regressions.yml.github/workflows/ci.yml.github/workflows/kani-pr.yml.github/workflows/property-tests.ymldocs/developers-guide.mdtests/workflow_contracts/runner_placement_test.pytests/workflow_contracts/workflow_support.py
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GitHub-hosted minutes cost nothing on a public repository, so a pull request authored by dependabot[bot] now falls back to ubuntu-latest like a fork's. The expression tests pull_request.user.login rather than github.actor, which changes when someone re-runs or pushes. A push to main has no pull_request payload and stays on Ubicloud, so main still writes the cache. `workflow_support.py` gains a `NON_DEPENDABOT_GUARD`: the conditional-runner reader accepts the combined fork/Dependabot condition (and the benchmark lanes' `!= 'dependabot[bot]'` atom) and `runner_placement_test.py` requires the guard on every paid pull-request lane. The two `benchmark-regressions.yml` lanes (which put the paid label first) carry the positive form `&& github.event.pull_request.user.login != 'dependabot[bot]'`. Bespoke contract, so this PR takes the full review gate.
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✅ Action performed
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Part of DF12-89
Rollout of the pattern in leynos/typos-config-builder#152 (reviewed and merged): Dependabot pull requests on a public repository run on GitHub-hosted runners, not Ubicloud. User decision of 19 October 2026.
Change
Every Ubicloud
runs-onthat has the fork fallback gains the Dependabot arm, in the pilot's shape:pull_request.user.login(the author), notgithub.actor, which changes on a re-run.mainhave nopull_requestpayload and stay on Ubicloud, so main's caches stay warm.workflow_support.pygains aNON_DEPENDABOT_GUARD: the conditional-runner reader accepts the combined fork/Dependabot condition (and the benchmark lanes'!= 'dependabot[bot]'atom) andrunner_placement_test.pyrequires the guard on every paid pull-request lane. The twobenchmark-regressions.ymllanes (which put the paid label first) carry the positive form&& github.event.pull_request.user.login != 'dependabot[bot]'. Bespoke contract, so this PR takes the full review gate.docs/developers-guide.mdrecords the reason and the cold-cache consequence.Check script row (before)
["chutoro", "pending", "7 ubicloud jobs, 6 lacking the arm"]from~/docs/jm5-dependabot-runners/bin/check.pyonorigin/HEADbefore this change.Gates
pytest tests/workflow_contracts --doctest-modules(522 passed),mdtablefix --checkclean.Mutation proof
ci.yml:user.loginreplaced byactor(all jobs)ci.yml: Dependabot arm removed (first job)kani-pr.yml:user.loginreplaced byactor(all jobs)kani-pr.yml: Dependabot arm removed (first job)property-tests.yml:user.loginreplaced byactor(all jobs)property-tests.yml: Dependabot arm removed (first job)tests/workflow_contracts/workflow_support.py:frozenset({NON_FORK_GUARD, NON_DEPENDABOT_GUARD}),->frozenset({NON_FORK_GUARD}),benchmark-regressions.yml: author test removed from both jobsMerge class
Mechanical rollout of the pilot's shape (same expression, same form of contract change, docs paragraph, mutation proof), per the lead's ruling of 19 October.
Overlapping open PRs
These open PRs touch the same kind of files; per the standing rulings they do not hold this PR and are left untouched:
Summary by Sourcery
Run Dependabot pull requests on GitHub-hosted runners while preserving Ubicloud placement for eligible paid lanes and main-branch pushes.
New Features:
Enhancements:
Tests:
Selector proof
Selector proof: natural Dependabot runs on ubuntu-latest, all green: https://github.com/leynos/actix-v2a/actions/runs/39958329992, https://github.com/leynos/typos-config-builder/actions/runs/39990740324, https://github.com/leynos/agentland/actions/runs/39965006591; and a main push staying on ubicloud-standard-2: https://github.com/leynos/typos-config-builder/actions/runs/39181228629.